data in44;
 input a b c d y;
 ab=a*b;
 ac=a*c;
 ad=a*d;
 bc=b*c;
 bd=b*d;
 cd=c*d;
 abc=ab*c;
 abd=ab*d;
 acd=ac*d;
 bcd=bc*d;
 abcd=abc*d;
cards;
-1 -1 -1 -1  15.1
 1 -1 -1 -1  20.6
-1  1 -1 -1  68.7
 1  1 -1 -1 101.0
-1 -1  1 -1  32.9
 1 -1  1 -1  46.1
-1  1  1 -1  87.5
 1  1  1 -1 119.0
-1 -1 -1  1  11.3
 1 -1 -1  1  19.6
-1  1 -1  1  62.1
 1  1 -1  1 103.2
-1 -1  1  1  27.1
 1 -1  1  1  40.3
-1  1  1  1  87.7
 1  1  1  1 128.3
;
run;